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Updated: Oct 19, 2025

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

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Published on: February 27, 2019

Triboelectric effect-modulated varifocal liquid lens.

Chunlong Fang^1,2, Yuanzhi Cao¹, Dongdong Jiang¹

¹CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, 100083 Beijing, P.R. China.

Microsystems & Nanoengineering

|September 27, 2021

Summary

This study introduces a novel varifocal liquid lens powered by a triboelectric nanogenerator (TENG). This TENG-based varifocal liquid lens (TVLL) allows direct focal length control via mechanical sliding, eliminating the need for external power sources.

Keywords:

Engineering Other nanotechnology

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Area of Science:

Optoelectronics
Nanotechnology
Materials Science

Background:

Electrically modulated varifocal liquid lenses typically require external high-voltage power sources.
These lenses are crucial for advanced artificial optical systems.
Existing modulation methods often involve complex power conversion circuits.

Purpose of the Study:

To demonstrate a triboelectric nanogenerator (TENG)-based varifocal liquid lens (TVLL).
To enable direct focal length modulation using external mechanical stimuli.
To explore applications in micro-optical-electro-mechanical systems (MOEMS) and artificial vision.

Main Methods:

Fabrication of a varifocal liquid lens integrated with a TENG.
Utilizing dielectrophoretic force generated by TENG charge transfer to alter the air-liquid interface shape.
Employing external mechanical sliding to control the TENG and thus the lens focal length.

Main Results:

Successfully demonstrated a TENG-based varifocal liquid lens (TVLL).
Achieved continuous focal length adjustment (concave to convex) without a boost converter.
Developed a functional triboelectric magnifying glass utilizing the TVLL's precise light modulation.

Conclusions:

The TENG serves as an effective medium for modulating liquid lens focal length via mechanical input.
This TVLL offers a self-powered, controllable solution for optical systems.
Potential applications span MOEMS, human-machine interaction, and artificial vision systems.